Expert answer:PLEASE READ EACH AND EVERY LINE OF ASSIGNMENT DETAILS -INSTRUCTION FILE CAREFULLY AND THEN TELL ME IF YOU CAN HANDLE IT PERFECT WITHIN EXACT 27 HRS FROM NOW
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assignmentdetails_instructions.docx
project_memos.411_f17.pdf
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It’s only a one page memo and I can handle it, but I’m not sure how to get specifications for
the tower.
I tried to solve for the terminal flows but I am stuck on how to find the reflux ratio and the
other
I will need to have the specifications for the tower as listed in the memo that I sent. Also a
plots that are listed in the memo. Is that seems okay to you?
I’ve sent you the full memos. So, in memo 1, we are given the constraints to make a base
case distillation tower (all data can be found there). I was tasked to figure out all the
specifications of the distillation tower such as the terminal stream, reflux ratio, reboiler and
condenser heat duty and etc. as shown in memo 2. I would like to have you determine all
the parameters in memo 2 and tell me what parameters are the most sensitive, so I can
tweaked that parameters to optimize the distillation tower.
So the first one is memo 1 that tell us that we want distillation tower with that constraint
listed, but we don’t know about the terminal streams and others specifications. Don’t worry
about the economic analysis on first part. I’ll figure that out.
On 2nd page is the 2nd memo, which listed all the specifications that needs to be
determined. Don’t worry about the installed capital cost, I will do that one. I’d like you to
figure out the other specification of the distillation tower, such as terminal streams, reflux
ratio, etc. For the tray type and material, you just need to choose the most efficient one, or
probably I can look that one up.
That are the only things that I want you to figure out. I’ll take care of the 3rd and last page of
the memo.
November 1, 2017
TO:
All Design Groups in CHE 411
FROM:
Gregory L. Rorrer, Project Director
Beaver Biofuels Corporation
SUBJECT:
Preliminary Cost-Optimal Design of a Distillation Unit for Separating Ethanol from
Water in a Biofuels Plant (Memo #1 of 3)
Beaver BioFuels Corporation is requesting a preliminary design and economic analysis of a distillation
process for recovering and purifying ethanol from a clarified fermentation broth containing 13 vol%
ethanol in water. Please design a process that will result in the lowest break-even cost of 95 vol%
ethanol per 1000 pounds of distillate, and submit your recommendations by November 30 at 5 pm.
Guidelines on the suggested technical analysis breakdown and the reporting requirements will be
provided in two later memos. Below are process design constraints, simplified economic analysis
constraints, internal data, and suggestions to help frame the analysis.
Initial Design Constraints and Economic Analysis Assumptions
Proposed Ethanol Recovery and Purification Process (Base Case)
Feed:
Distillate:
Bottoms:
Tower Diameter:
Utilities – Cooling Water:
Utilities – Steam:
13 vol% ethanol in water at 86 oF (clarified fermentation broth)
$0.015/lb feed cost (Beaver BioFuels Corp internal data)
95 vol% ethanol (ca. 190 proof)
24,000 lb/day production rate
no more than 1.0 wt% ethanol in bottoms
2.0 ft (fixed)
86 oF delivery temperature from cooling tower
121 oF maximum return temperature to cooling tower
$0.10/1000 gallons (Beaver BioFuels internal data)
150 psig steam utility available, natural gas fired boiler
Simplified Economic Analysis
Operating Costs
Capital Costs
Prelim Total Cost
Break-Even Cost
Sum of utility and feed costs. Neglect energy costs for pumping operations.
Operation 360 days per year, 24 hours per day.
Cost of tray tower and heat exchangers. Neglect reflux pump costs. Assume
that Installed Cost = 5 x Purchased Cost.
Sum of operating and capital costs for a three-year project life in constant 2017
dollars.
$ total cost/1000 lb of distillate produced.
November 14, 2017
TO:
All Design Groups in CHE 411
FROM:
Gregory L. Rorrer
SUBJECT:
Preliminary Cost-Optimal Design of a Distillation Unit for Separating Ethanol from
Water (Memo #2 of 3, Technical Analysis)
Below are guidelines to aid in the presentation and analysis of the project outcomes. These guidelines
also articulate the minimum standards for the technical analysis.
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Plot total capital cost and total operating cost as a function of the key process variable(s) that you
identified as important to reduce costs. Is there an optimum capital cost?
Plot total cost per 1000 lb of distillate as a function of the key process variable(s).
Define the “base case” for your design, and then summarize your final, recommended design in
tabular form, comparing the “base case” to the “optimum case”. Include (as a minimum) the
following:
Distillation Tower
Terminal stream flows and compositions
External reflux ratio
Number of real trays required for separation
Tray type and material (sieve tray, bubble cap, etc.)
Assumed tray efficiency (typically 80% for ethanol-water)
Tower diameter (fixed at 2.0 ft)
Installed capital cost
Reboiler
Heat exchanger area (ft2)
Heat duty (BTU/hr)
Steam delivery pressures and temperature
Steam mass flowrate (lb/hr)
Installed capital cost
Steam operating cost ($/day)
Overhead Condenser
Heat exchanger area (ft2)
Heat duty (BTU/hr)
Cooling water inlet/outlet temperatures
Cooling water mass flowrate (lb/hr)
Installed capital cost
Cooling water operating cost ($/day)
•
You might want to use a spreadsheet for repetitive calculations for the material balance (terminal
streams, overhead vapor, reboiler vapor), heat exchanger design (reboiler and condenser), steam and
cooling water requirements, and economics analysis.
•
You might want to use a software platform for repetitive tower design calculations (e.g. number of
stages).
November 14, 2017
TO:
Design Groups in CHE 411
FROM:
Gregory L. Rorrer
SUBJECT:
Preliminary Cost-Optimal Design of a Distillation Unit for Separating Ethanol from
Water (Memo #3 of 3, Reporting Requirements)
Please provide a one-page, typed memo highlighting your proposed preliminary design recommendations
for the cost-optimal design of ethanol/water separations unit. The memo will be assessed as part of your
overall project evaluation. This memo should include the following:
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•
•
•
•
•
•
•
Memo heading, including date, to/from, and subject of memo
Acknowledgement of request for the preliminary design, provide assignment and completion
dates
Scope (i.e. preliminary design) and technical objective(s) of your project
Brief description of process
Unique features of your design with special emphasis on what you think are the cost-saving features
Important outcomes of the analysis, for example: key equipment design parameters, key process
flows, operating/capital costs, etc. (you decide what is important to present in the memo)
Closing remarks, e.g., let the supervisor know where you can be contacted in case there are questions
regarding your recommendations
Labor charge ($50/hr for each member of your team)
Please write the memo in paragraph form with complete sentences, and refer to numbered Figures and
Tables as appropriate. Provide a topic sentence for each paragraph. Bulleted statements or incomplete
sentences will not be read.
Also, please attach the following technical documentation:
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Process flowsheet with numbered streams and labeled process equipment (Figure 1)
Table summarizing molar flowrates and compositions for each component in each numbered stream
(Table 1)
Table summarizing equipment design recommendations for the “base case” and the “optimized case”
(Table 2)
Table summarizing economic analysis for the “base case” and the “optimized case” (Table 3)
List of assumptions used in design calculations
References
Graphs (as numbered and titled Figures) showing sensitivity analysis of costs to key process
variables (e.g. Figure 2, 3 etc.)
Sample calculations showing key equations used in the analysis (required) and neatly-formatted
spreadsheets (required)
All Figures and Tables must be numbered and titled. The sample calculations may be hand written. All
calculations and spreadsheet column heading must include units.
Preliminary Cost-Optimal Design of a Distillation Unit (Memo #2)
Presentation of Results
• Memo
• Figure 1. Process flowsheet with numbered streams and labeled process
equipment, BASE CASE Vs. OPTIMIZED CASE.
• Table 1. Process material balance. Include molar flowrates and compositions
for each component in each numbered stream – BASE CASE vs. OPTIMIZED
CASE.
• Table 2. Equipment design recommendations for the BASE CASE vs.
OPTIMIZED CASE.
• Table 3. Economic analysis for the BASE CASE vs. the OPTIMIZED CASE.
• Graphs (as numbered and titled Figures) showing sensitivity analysis of costs
to key process variables (e.g. Figure 2, 3 etc.)
• Plot total capital and operating cost as a function of the key process
variable(s) that you manipulated in the attempt to reduce costs
• Plot total cost per 1000 lb of distillate as a function of the key process
variable(s)
• List of assumptions and references used in design calculations
• Sample calculations (no need to be a perfectionist here) and formatted
spreadsheets (required)
CHE 411: Mass Transfer Operations
Project In-Class Activity #1
A BASE CASE tray distillation tower will consist of a single liquid feed
at 71 oF, a partial reboiler and total condenser, a 24,000 lbm/day
production rate of 95 vol% ethanol in the liquid distillate, and a bottoms
containing no more than 1.0 wt% ethanol. Your only true constraint is
the production rate of the liquid distillate and its purity. All other
parameters can be subject to modification, except the tower diameter,
which is fixed at 2.0 ft.
Identify all of items that you pay for on a recurring basis (e.g. cooling
water, etc.), i.e. the operating costs
What operating conditions of the tower could be changed to reduce
costs?
What changes in equipment configuration could potentially reduce
operating costs?
…
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